CAMP ZAMA, Japan, Nov. 3 - Charles Robert Jenkins, the Army sergeant who left his soldiers and walked into North Korea in 1965 to avoid combat duty in Vietnam, received a light sentence Wednesday after pleading guilty in a court-martial here to desertion and aiding the enemy. After hearing bleak testimony about his harsh life in North Korea, an Army judge seemed to accept a defense lawyer's argument that Sergeant Jenkins, 64, had "already suffered 40 years of confinement." The judge, Col. Denise Vowell, then demoted him to private, stripped him of four decades of back pay and benefits, and...